Emails from the University of East Anglia's Climatic Research Unit have once again been released on the internet. The timing is similar to the "climategate" scandal of 2009, with emails published just before an important UN climate conference. Does this mean the science is in doubt? Quite the opposite, says Stephan Lewandowsky.

An ambulance pulls up behind you. You know it's an ambulance because you can read AMBULANCE in your rear view mirror. But you can also read it when you look at the vehicle directly; because the human visual system has the ability to quickly correct complete inversions or left-right reversals of letters. In fact, a complete inversion is easier to read than letters that are rotated only partially.

This human ability to process complete inversions more quickly than just partial distortions, alas, lends itself to exploitation by ruthless propagandists who seek to create a chimerical world in which up is down, left is right, and good is smeared as evil.

Nowhere is this more apparent than in the netherworld of attacks on climate scientists.

Remember "climategate"? The illegal hack of personal emails released just before the Copenhagen climate conference in 2009 that some columnists pronounced to be the (approximately 132nd) "final nail in the coffin" of global warming?

Then Lord Oxburgh (former chairman of Shell-UK) and his panel likewise exonerated the researchers, finding their "work has been carried out with integrity, and that allegations of deliberate misrepresentation" are "not valid."

This comes as no surprise to anyone with even a passing familiarity with the distinction between private chat and public actions.

And what has happened to the IPCC "Whatevergates"?

What's happened is this.

First, the Sunday Times apologised and retracted its "Amazongate" story. There is no "Amazongate"; there is only the Amazon rainforest threatened by climate change.

Then the Dutch government accepted responsibility for erroneously informing the IPCC that 55% of the Netherlands are below sea level. In fact only 26% are at risk of flooding because they are below sea level, whereas the other 29% are, err, at risk of flooding from rivers.

Because there are too many real climategates that must not escape attention.

First, there was another batch of private emails posted by the Competitive Enterprise Institute, a "think" tank notorious even by American standards. Those emails — yes, a second hack — revealed the real climategate by being truthful, with one scientist stating: "Those who deny the biophysical facts of the world would deny … gravity" and "we're not in a gentlepersons' debate, we're in a street fight against … merciless enemies. Colleagues … are getting threatened with prosecution by … [US Senator James M.] Inhofe."

The real climategate involves Bush White House staff replacing assessments of the National Academy of Sciences with a discredited paper by two individuals with no expertise in climatology. This paper, funded by the American Petroleum Institute, was so flawed its appearance in a peer-reviewed journal led to the resignation in protest by three editors and the publisher's unprecedented acknowledgement of mishandling.

Those are not merely historical episodes because the real climategate encompasses the ongoing complicity of some media organs.

In Canada, the real media climategate involves the ongoing list of defamatory articles by the "National Post." The tabloid is finally being sued by Professor Andrew Weaver of the University of Victoria.

In Australia, the real media climategate involves the national daily newspaper, whose misrepresentations of science are legendary and, sadly ongoing.

Those real climategates are the tip of an iceberg of venality enveloping anti-science interests and their enablers.

And just a few hours ago, another illegal release of personal emails among scientists was dumped on to the world in the lead-up to the next climate conference in Durban. First Copenhagen, now Durban. When the science is so rock solid that it can no longer be reasonably doubted, all that is left is to steal private correspondence in a desperate attempt to disparage those who are trying to protect the world from the risks it is facing.